Can I continue my pregnancy even though I took the first Myfiegyne?

The defects caused on the fetus probably depends on the pregnancy week. You no longer carry an embryo, but a fetus with arms and legs. The outcome might be different when the pill is taken before arms and legs have developed. If you read other people's stories, they need to be in the same week as you if you want to compare the outcome.

According to Wikipedia, the drug is not directly killing the fetus, but it prevents your pregnancy maintaining hormones from functioning. So I guess that the harm done on the fetus is because it doesn't get enough nutrients.